[Remoting iOS] Basic viewport manipulation support

remoting/client/ios/client_gestures.h

Index: remoting/client/ios/client_gestures.h
diff --git a/remoting/client/ios/client_gestures.h b/remoting/client/ios/client_gestures.h
index aea0d3ca352c89b5349bd2175dc21508181ade3e..45cfff4b464b3123f074b0d103a2a1882b547865 100644
--- a/remoting/client/ios/client_gestures.h
+++ b/remoting/client/ios/client_gestures.h
@@ -10,6 +10,8 @@
 #include "base/logging.h"
 #import "remoting/client/ios/key_input.h"
 
+@class RemotingClient;
+
 typedef NS_ENUM(NSInteger, HostInputScheme) {
   // Mouse cursor is shown
   // Dragging or Panning, moves the mouse cursor
@@ -42,10 +44,13 @@ typedef NS_ENUM(NSInteger, MouseButton) {
   UIScreenEdgePanGestureRecognizer* _edgeGesture;
   UISwipeGestureRecognizer* _swipeGesture;
 
+  __weak UIView* _view;
+  __weak RemotingClient* _client;
+
   HostInputScheme _inputScheme;
 }
 
-- (instancetype)initWithView:(UIView*)view;
+- (instancetype)initWithView:(UIView*)view client:(RemotingClient*)client;
 
 // Zoom in/out
 - (IBAction)pinchGestureTriggered:(UIPinchGestureRecognizer*)sender;